The I-Beam Cross was an obstacle, first appeared as the fifth on American Ninja Warrior 7 in San Pedro (Military). It consisted of a customized beam which competitors must cross with their arms and legs from underneath similar to the Spider Flip. The ledges of the beam varied in width from one to three inches. Many competitors had trouble with the middle part of the beam, where it turned from horizontal to vertical, raised a couple feet, and turned back horizontal. Only 10 competitors could complete this obstacle during San Pedro (Military) qualifiers.The I-Beam Cross returned as the fifth obstacle on American Ninja Warrior 8 in Los Angeles. However, there was a minor modification on the first horizontal part of the beam (with a gap in which competitors had to cross over). 19 competitors could complete this obstacle during Los Angeles qualifiers (including Natalie Duran and Jessie Graff).
An upgraded version of the I-Beam Cross (called the I-Beam Gap), appeared as the fifth obstacle on American Ninja Warrior 9 in Cleveland. However, this obstacle is a fusion between the I-Beam Cross and the Spider Flip. Competitors will start the obstacle horizontally, and must cross the ledges with their arms and legs from underneath. Then, they must go vertical and must do a 180 degrees jump onto another setup, placed higher than the first setup (similar to the Spider Flip). Then, competitors must climb back down and must dismount on the platform to advance. Some parts of the beam have no ledges, which make it harder for competitors to traverse. 15 competitors completed this obstacle during Cleveland qualifiers (including Allysa Beird and Jesse Labreck).